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March 28, 2017

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A cheetah runs a distance of 102 m at a speed of 27 m/s and then runs another 102 m in the same direction at a speed of 34 m/s. What is the cheetah's average speed?

  • physics - ,

    Average speed means total distance traveled divided by time. It is a average over time, not an average over distance.

    Total time = 204/Vav = 102/34 + 102/27
    2/Vav = 1/34 + 1/27
    Solve for Vav

    Vav = 2/[1/34 + 1/27] = 30.1 m/s

    Note that it is not the average of 27 and 34.That would be 30.5 m/s.

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